AKITSORA GAMING

Yamata no Orochi

Eight heads. Knock them down one by one.

Yamata no Orochi is an 8×3, 6561-ways boss fight: swords knock out the eight heads one by one, and every fallen head turns its reel into a wild that multiplies with the rest.

Demo play uses virtual credits with no monetary value.

RTP
96.66%
Volatility
Very high33.08
Max win
25,000× bet
Bonus buy
142.99 / 545.25× bet

In-game screens

Captured straight from the running game — real boards, real wins.

Yamata no Orochi — Base game
Base game8 reels × 3 rows, 6561 ways. Eight round little serpent heads stand above the reels, one per reel.
Yamata no Orochi — A ways win
A ways winWins start from 3 consecutive reels from the left; the capsule shows the symbol, the reels and the product of matches per reel.
Yamata no Orochi — The Orochi hunt
The Orochi huntEach head's stamina shows on its neck; swords fly up to hit them, and fallen heads turn their reels into ×2 serpent wilds.
Yamata no Orochi — Big win
Big winCapped at 25,000× the bet per round.
Yamata no Orochi — Bonus buy
Bonus buyTwo tiers: 142.99× for the hunt, 545.25× for a hunt with 2 heads already down.
Yamata no Orochi — In-game paytable
In-game paytableThe same game definition as the table on this page: the game receives it from the server, and this page reads it at build time.

Specification

Type8 reels × 3 rows, ways (6561 ways, 3+ consecutive reels from the left)
Return to player (RTP)96.66%
Bonus buy RTP (Orochi hunt)96.66%
Bonus buy RTP (Orochi hunt — two heads down)96.66%
VolatilityVery high (33.08)
Hit rate29.11%
Rounds winning ≥ 1× bet12.71%
Max win per round25,000× bet
Orochi hunt (free spins) frequency≈ 1 in 294.79 spins
RTP verificationExact base game + 27,000,000 feature samples; combined RTP 96.6355%, 2σ margin ±0.0706 percentage points

Game math specifications and the paytable are read at build time from the definitions shared with the server code. See Math version for the configuration shown; confirm any other version or operator-specific settings separately.

How wins work

  • The grid is 8 reels × 3 rows with 6561 ways and no paylines.
  • A win needs the same symbol (or a wild) on every reel in a row from the leftmost reel, at least 3 reels; the pay = table value × the product of matching symbols per reel.
  • The sword flash is a wild on reels 2–8 and substitutes for every regular symbol.
  • Sake barrels count anywhere on the grid: 3 or more start the Orochi hunt (free spins).

Paytable

Values are multiples of the total bet for one way: win = total bet × table value × the product of matching symbols on each reel (a sleeping-serpent reel counts as one match ×2, and several serpent reels multiply together). The same numbers as the in-game paytable.

Symbol3 reels4 reels5 reels6 reels7 reels8 reels
Princess KushinadaHigh-pay 1.63.24.86.48.812
Serpent jewelHigh-pay 1.22.43.64.86.69
Bronze bellHigh-pay 0.81.62.43.24.46
CombHigh-pay 0.641.281.922.563.524.8
Rice earsLow-pay 0.320.640.961.281.762.4
Sake cupLow-pay 0.240.480.720.961.321.8
BonfireLow-pay 0.20.40.60.81.11.5
Sacred ropeLow-pay 0.160.320.480.640.881.2

Special symbols

Sword flash

Wild on reels 2–8; substitutes for every regular symbol.

Sake barrel

Counts anywhere: 3/4/5 start 10/12/15 hunt spins. Does not appear during the hunt.

Totsuka sword

Hunt only: a sword on reel k hits head k for 1 stamina. It pays nothing and substitutes for nothing.

Sleeping serpent

A knocked-out head fills its reel as a wild ×2; several multiply, up to ×256.

Features

The Orochi hunt — eight heads with stamina

3/4/5 sake barrels start 10/12/15 hunt spins. Each of the eight heads sits above its own reel with 3–6 stamina (shown on its neck). Totsuka swords land only during the hunt: a sword on reel k hits head k for 1 stamina.

Sake cup — tipsy heads

A sake cup on a reel makes that head tipsy: the next hit takes 2 stamina (a sword landing the same spin counts — tipsy first, then hit), and the head sobers up once hit.

Sleeping serpents — multiplying reel wilds

A head at zero stamina is knocked out and slumps onto its reel: from that spin on, the whole reel is a sleeping serpent (wild ×2) and stays. Serpents a way passes through multiply together — all eight down is ×256.

Kusanagi sword

All eight heads down: that spin pays as usual; on the next spin the Kusanagi sword bursts out of the serpent's tail and doubles the whole hunt's win (×2), then the hunt ends.

Volatility — positioning

Volatility 33.08. Hit rate 29.11% counts rounds with any win; 12.71% of all rounds return at least the stake. The base game carries about 45% of the RTP and the hunt arrives about once every 294.79 spins; each fallen head doubles every way through it, so the tail is long. Capped at 25,000× the bet per round. This describes the product's positioning and does not guarantee session outcomes.

Bonus buy (two tiers)

Pay 142.99× the bet to start the hunt directly (10 spins), or 545.25× for a hunt that starts with 2 heads already down (chosen at random). Each price comes from the expected value measured along its own path (buy RTP 96.66% / 96.66%) and is calibrated separately from the base game.

Technical

Game codeaki_orochi
Math versionoc1
TechnologyHTML5, no plug-in; one client for desktop and mobile
ViewportLandscape with proportional scaling
In-game languageTraditional Chinese (additional languages on request)
CurrenciesTWD (others can be registered on request)
IntegrationTransfer wallet (Operator API v3), launch-token redirect

Sources & verification scope

This product specification is written and maintained by its developer, Akitsora Gaming (AKI電子 in Taiwan). Measurement methods and sample information for RTP, volatility and hit rate appear in the specification table. Sampled results have uncertainty; RTP describes long-run return, not an individual player or session outcome.

Internal simulations and tests are not independent certification. We do not currently hold GLI or BMM certification reports. Supply to a market requiring third-party certification depends on completing its requirements.

See slot game development and supply for integration and supply scope, About us for development and content responsibility, or contact us for a math summary, version confirmation or a correction to this page.

The story

Fiction and adapted settings written by Akitsora Gaming for this title, including invented dialogue and events. This is not a historical or folklore reference. The rules and specification tables define the gameplay and math.

Rain lashes the Hii River as eight great barrels of brewed sake line the bank.
When all eight heads fall fast asleep, the sacred sword springs forth from the tail.

I. A Stormy Night in Izumo

In the ancient myth-shrouded land of Izumo, torrential rain had swollen the Hii River for days on end. Behind the mist-covered hills coiled a colossal serpent with eight round, mischievous heads—the legendary Yamata no Orochi—each head peering down from the storm clouds with a fondness for strong sake and village uproar. Thunder rumbles across the swollen riverbanks of Izumo as torchlight flickers against the rain-slicked cedar fences.

This expansive eight-reel, four-row all-ways board places one of the serpent’s eight heads directly above each column of the grid. Beneath them spin sacred magatama beads, bronze mirrors, kagura bells, wooden combs, flame drums, and the storm god Susanoo himself, bridged across reels two through eight by the gleaming Sword Flash Wild. Every clash of steel and splash of sacred sake brings the ancient chronicle to life across the stormy eight-column battlefield.

II. Sake Barrels and the Totsuka Blade

To outwit the mighty creature without relying on brute force alone, the storm god Susanoo set a clever trap along the riverbank: eight fenced gates, each holding a brimming vat of eightfold-brewed sake. Landing enough Sake Barrel scatters anywhere on the grid springs the trap and launches the Orochi Hunt free spins. Thunder rumbles across the swollen riverbanks of Izumo as torchlight flickers against the rain-slicked cedar fences.

Above the eight columns, every serpent head displays its own stamina bar on its neck. Whenever a Totsuka Sword lands on a reel during the hunt, it strikes the head directly above to chip away its stamina—and if a Sake Cup lands on a reel first, that head turns rosy-cheeked and tipsy, taking double stamina damage from the next sword blow.

III. Sleeping Serpents Across the Reels

The moment any serpent head’s stamina drops to zero, stars spin around its dizzy eyes and it slumps fast asleep across its entire column on the board. From that spin until the end of the feature, the fallen head remains locked in place as a full-reel Sleeping Serpent Wild snoring through the storm. Thunder rumbles across the swollen riverbanks of Izumo as torchlight flickers against the rain-slicked cedar fences.

Every Sleeping Serpent reel carries its own multiplier, and whenever a winning way passes through multiple sleeping heads across the eight columns, their multipliers multiply together. With each additional head knocked into dreamland, another full column turns wild and the compounding multiplier climbs exponentially across the grid. Every clash of steel and splash of sacred sake brings the ancient chronicle to life across the stormy eight-column battlefield.

IV. All Eight Down and the Kusanagi Sword

Watching the eight heads topple one after another turns the free-spins round into a true mythic boss battle on the riverbank: every fallen head narrows the gaps between reels and floods the eight-column grid with sleeping wild columns and ways combinations on every turn. Thunder rumbles across the swollen riverbanks of Izumo as torchlight flickers against the rain-slicked cedar fences.

Should you knock out the final head so that all eight heads are asleep at once, the storm clouds over Izumo part at last. On the closing beat, the legendary Kusanagi Sword—the Sword of the Gathering Clouds of Heaven—bursts gleaming from the serpent’s tail to double the entire hunt’s accumulated prize. Every clash of steel and splash of sacred sake brings the ancient chronicle to life across the stormy eight-column battlefield.

Want to spin Yamata no Orochi yourself?

The demo needs no account — click and spin. For integration docs, the math summary or sandbox access, send us an email.

Demo play uses virtual credits with no monetary value.